It has a large immigrant population as well. Why is this? In Loudoun County? It makes sense in Lorton/Centreville because it's by PWC. But why would an area up there by Great Falls and Leesburg be lower-middle class?

Sterling, VA encompasses the older Sterling Park development that was
constructed in the 1960's. Herndon, VA includes the older housing
construction of single family homes and apartments around Alabama Ave./Elden
St. area. Also, from the 1960's... These older properties are less expensive
to purchase in what is now 'weathier zip codes.' Attractive to anyone looking
to purchase lower cost residences and would certainly include immigrants.

These beaners reproduce like rabbits with no regard for responsibility or the consequences.

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The best reply to this may be a bedtime story.

Once upon a time, there were Many Republicans who lived in Northern Fairfax county and Loudon County.
The democrats did not like that very much.
So, as areas were "developed" they always looked for ways to bring in subsidized housing and high-density housing.
One way was to force developers to include townhouses and apartments to be built. That way, lower income people could come and live in these areas.
Another way was to move government buildings to Northern Virginia. Because then government workers would follow.
Another way was to encourage immigrants - lots of immigrants -- to come and live in areas that used to be affluent or majority white.
Where ever there were many Republicans in Northern Virginia, they would build lots of high density and subsidized housing as well as find ways to bring in more government workers.
The Democrats do not care if it makes nice places yechy.
The Democrats did not care that they were building the slums of the future.
They just want them to "turn blue" so they can appoint their friends to committees and control $$$ and have power.
End of bedtime story.
Reality is also this: I keep noticing so many Arab people and Middle Eastern people moving up and down the route 28 corridor.
It's obviously not a random phenomenon, and it is not driven primarily by economics.
there are also lots of Indian people in the area, but it seems that the Indians and many of the other Asian people want to work hard and assimilate... but they too will probably vote blue.

There is a neighborhood that was just built as part of Loudoun One. If you peruse the land records for that community, you will notice that not only is it classified as "high density", but you can take any of the streets with occupied homes (sold in the 600,000+ range) and you will notice that, in the county land-owner records for one of those neighborhood streets, you find maybe 10 or fewer out of the owners on that whole street that actually have have a pronounceable American name--most of the the rest of the 90 percent of those residents seem to be from Asian and Indian/Pakistani and Middle Eastern countries. Seems as if they might now be the people who are rich enough to come into America and can buy up all the expensive real estate around here.

Makes me wonder how the developers of that land got away with charging such high prices in a neighborhood full of high cost/high density houses that sits directly beneath the main landing path for the jumbo jets landing at Dulles a few miles away? The jumbo-jet-on-the-roof style high decibel noise level there continues 24 hours a day, especially when all of the jumbos have to use that runway minutes apart throughout the day and night when the wind is from the south.

Actually, from 000-0430 there are little to no air traffic at Dulles. I track all aircraft from Dulles via my ADS receiver (I feed this to Flightaware as well.)

I have metrics and graphs, its 99.9% the same time, every day.